G305.4–2.2
| Nebula | |
|---|---|
| Observation data | |
| Class | Supernova remnant |
| Distance | 2.2 k pc |
| Physical characteristics | |
| Radius | 3.3 pc |
| Notable features | Nearly perfectly round shape |
| Designations | Teleios |
G305.4–2.2 is a supernova remnant located at a distance of 2.3 kpc with a rare circular symmetry in shape, nicknamed Teleios (Greek: τέλειος "perfect"). It has a radius of 3.3 parsecs. It is one of the most circular known supernova remnants. The age of G305.4-2.2 is not known with much precision with it either being young and under 1000 years old or an older remnant being over 10,000 years old.[1][2]
It was identified in the radio-continuum images of the Australian Square Kilometre Array Pathfinder (ASKAP) Evolutionary Map of the Universe by a group of astronomers led by Miroslav D. Filipović of Western Sydney University.[3][2][1]
References
- ^ a b Filipovic, Miroslav D.; et al. (2025). "Teleios (G305.4-2.2) -- the mystery of a perfectly shaped new Galactic supernova remnant". arXiv:2505.04041 [astro-ph.HE].
- ^ a b Observations detect a perfectly shaped supernova remnant Tomasz Nowakowski, Phys.org, May 15, 2025
- ^ Perfect symmetry: Astronomers find unusual supernova remnant Mykyta Lytvynov, Universe (magazine), May 16, 2025